Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5277aeed42ee4bf3345538c60b45394b9774caa12403e0eed3af0fcb180ad8f5' 
  AND token = 'zW98bNkMEznjekn97HhRGqoki3TA8njGSsFOn0Yv76w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}